Is there a limit to the amount of Apps that can be added?

When a tab contains a very large number of apps, this could affect the performance of your dashboard. For optimum use, we limit the number of apps per tab to 50. You can always split apps into several tabs or dashboards. You can also refine your corpus of sources using our Spring Cleaning tool at http://www.netvibes.com/account/spring-cleaning/all-sources